--- /dev/null
+/*
+ * Check decoding of wait4 syscall.
+ *
+ * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <assert.h>
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/resource.h>
+
+static const char *
+sprint_rusage(const struct rusage *const ru)
+{
+ static char buf[1024];
+ snprintf(buf, sizeof(buf),
+ "{ru_utime={%lu, %lu}"
+ ", ru_stime={%lu, %lu}"
+#ifdef VERBOSE_RUSAGE
+ ", ru_maxrss=%lu"
+ ", ru_ixrss=%lu"
+ ", ru_idrss=%lu"
+ ", ru_isrss=%lu"
+ ", ru_minflt=%lu"
+ ", ru_majflt=%lu"
+ ", ru_nswap=%lu"
+ ", ru_inblock=%lu"
+ ", ru_oublock=%lu"
+ ", ru_msgsnd=%lu"
+ ", ru_msgrcv=%lu"
+ ", ru_nsignals=%lu"
+ ", ru_nvcsw=%lu"
+ ", ru_nivcsw=%lu}"
+#else
+ ", ...}"
+#endif
+ , (long) ru->ru_utime.tv_sec
+ , (long) ru->ru_utime.tv_usec
+ , (long) ru->ru_stime.tv_sec
+ , (long) ru->ru_stime.tv_usec
+#ifdef VERBOSE_RUSAGE
+ , (long) ru->ru_maxrss
+ , (long) ru->ru_ixrss
+ , (long) ru->ru_idrss
+ , (long) ru->ru_isrss
+ , (long) ru->ru_minflt
+ , (long) ru->ru_majflt
+ , (long) ru->ru_nswap
+ , (long) ru->ru_inblock
+ , (long) ru->ru_oublock
+ , (long) ru->ru_msgsnd
+ , (long) ru->ru_msgrcv
+ , (long) ru->ru_nsignals
+ , (long) ru->ru_nvcsw
+ , (long) ru->ru_nivcsw
+#endif
+ );
+ return buf;
+}
+
+static pid_t
+do_wait4(pid_t pid, int *wstatus, int options, struct rusage *ru)
+{
+ sigset_t mask = {};
+ sigaddset(&mask, SIGCHLD);
+
+ assert(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
+ pid_t rc = wait4(pid, wstatus, options, ru);
+ assert(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0);
+ return rc;
+}
+
+int
+main(void)
+{
+ tprintf("%s", "");
+
+ int fds[2];
+ if (pipe(fds))
+ perror_msg_and_fail("pipe");
+
+ pid_t pid;
+ pid = fork();
+ if (pid < 0)
+ perror_msg_and_fail("fork");
+
+ if (!pid) {
+ char c;
+ (void) close(1);
+ assert(read(0, &c, sizeof(c)) == 1);
+ return 42;
+ }
+
+ (void) close(0);
+
+ int *const s = tail_alloc(sizeof(*s));
+ if (wait4(pid, s, WNOHANG|__WALL, NULL))
+ perror_msg_and_fail("wait4 #1");
+ tprintf("wait4(%d, %p, WNOHANG|__WALL, NULL) = 0\n", pid, s);
+
+ struct rusage *const rusage = tail_alloc(sizeof(*rusage));
+ if (wait4(pid, s, WNOHANG|__WALL, rusage))
+ perror_msg_and_fail("wait4 #2");
+ tprintf("wait4(%d, %p, WNOHANG|__WALL, %p) = 0\n", pid, s, rusage);
+
+ assert(write(1, "", 1) == 1);
+ (void) close(1);
+
+ assert(do_wait4(pid, s, 0, rusage) == pid);
+ assert(WIFEXITED(*s) && WEXITSTATUS(*s) == 42);
+ tprintf("wait4(%d, [{WIFEXITED(s) && WEXITSTATUS(s) == 42}], 0, %s)"
+ " = %d\n", pid, sprint_rusage(rusage), pid);
+
+ pid = fork();
+ if (pid < 0)
+ perror_msg_and_fail("fork");
+
+ if (!pid) {
+ (void) raise(SIGUSR1);
+ return 1;
+ }
+
+ assert(do_wait4(pid, s, __WALL, rusage) == pid);
+ assert(WIFSIGNALED(*s) && WTERMSIG(*s) == SIGUSR1);
+ tprintf("wait4(%d, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGUSR1}]"
+ ", __WALL, %s) = %d\n", pid, sprint_rusage(rusage), pid);
+
+ if (pipe(fds))
+ perror_msg_and_fail("pipe");
+ pid = fork();
+ if (pid < 0)
+ perror_msg_and_fail("fork");
+
+ if (!pid) {
+ (void) close(1);
+ raise(SIGSTOP);
+ char c;
+ assert(read(0, &c, sizeof(c)) == 1);
+ return 0;
+ }
+
+ (void) close(0);
+
+ assert(do_wait4(pid, s, WSTOPPED, rusage) == pid);
+ assert(WIFSTOPPED(*s) && WSTOPSIG(*s) == SIGSTOP);
+ tprintf("wait4(%d, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}]"
+ ", WSTOPPED, %s) = %d\n", pid, sprint_rusage(rusage), pid);
+
+ if (kill(pid, SIGCONT))
+ perror_msg_and_fail("kill(SIGCONT)");
+
+#if defined WCONTINUED && defined WIFCONTINUED
+ assert(do_wait4(pid, s, WCONTINUED, rusage) == pid);
+ assert(WIFCONTINUED(*s));
+ tprintf("wait4(%d, [{WIFCONTINUED(s)}], WCONTINUED"
+ ", %s) = %d\n", pid, sprint_rusage(rusage), pid);
+#endif /* WCONTINUED && WIFCONTINUED */
+
+ assert(write(1, "", 1) == 1);
+ (void) close(1);
+
+ assert(do_wait4(pid, s, 0, rusage) == pid);
+ assert(WIFEXITED(*s) && WEXITSTATUS(*s) == 0);
+ tprintf("wait4(%d, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0"
+ ", %s) = %d\n", pid, sprint_rusage(rusage), pid);
+
+ assert(wait4(-1, s, WNOHANG|WSTOPPED|__WALL, rusage) == -1);
+ tprintf("wait4(-1, %p, WNOHANG|WSTOPPED|__WALL, %p) = -1 %s (%m)\n",
+ s, rusage, errno2name());
+
+ tprintf("%s\n", "+++ exited with 0 +++");
+ return 0;
+}
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